STM32WBA_BLE_UM |
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STM32WBA BLE Stack User Manual |
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Revision history
27 January 2023 - Rev 1.0 - First release.
March 2023 - Rev 1.1 - Update maximum number of supported Links and a new condition to call the BleStack_Process.
Contents
2.4 Library compilation options
2.5 Application compilation options
3.3.2 Direct mode for commands and data sending
3.3.3 BLE Asynchronous ACI/HCI events and data reception
4.1 BLE platform initialization
Table 3: BleStack_Init function
Table 4: BleStack_Init function's parameters. 1
Table 5: BleStack_Process function
Table 6: BleStack_Request function
Table 7: BLECB_Indication function
Table 8: BLEPLAT_Init function
Table 9: BLEPLAT functions' returns
Table 10: BLEPLAT NVM functions
Table 11: BLEPLAT Timer functions
Table 12: BLE PLAT AES functions
Table 13: BLEPLAT PKA functions
Table 14: BLEPLAT RNG function
Figure 1: BLE library folder structure
This document describes to an application developer how to integrate the SMT32WBAxx BLE stack library.
This document covers only the BLE stack library integration, and it does not include the Link Layer integration aspects.
Acronym |
Definition |
HCI |
Host Controller interface |
ACI |
Application Controller Interface |
N/A |
Not Applicable |
Table 1: Acronyms definitions
- STM32WBA_BLE_Wireless_Interface.html
- STM32WBAxx reference manual
The BLE stack delivery contains 3 folders as following:
Figure 1: BLE library folder structure
- “doc” folder contains the current document and “STM32WBA_BLE_Wireless_Interface.html” which describes the BLE Application Commands Interface (ACI) and the Host Commands Interface (HCI).
- “include” folder contains the header files of the BLE stack library interface. These files contain some definitions of constants and types and the declarations of ACI and HCI functions. It also contains the declarations of some external modules’ functions used by the BLE stack (for more details see section 4.2)
- “lib” folder contains the 4 BLE stack library variants described in the following section.
The BLE stack library is delivered in 4 variants:
· 2 variants containing the BLE host stack:
o Full stack (stm32wba_ble_stack_full.a)
o Basic stack (stm32wba_ble_stack_basic.a)
· 2 variants without the BLE host stack (controller only)
o Link Layer Only stack (stm32wba_ble_stack_llo.a)
o Link Layer Only Basic stack (stm32wba_ble_stack_llobasic.a)
Here are the 4 BLE stack variants details:
- Full stack (stm32wba_ble_stack_full.a) includes the LE Controller and the Host Stack, and contains all the legacy stack supported features plus the extended advertising, GATT caching, ACI HCI flow control, isochronous support for audio, L2CAP connection oriented channels.
Note: This BLE stack variant can be configured to run in controller only mode (host stack is bypassed).
See the parameter “options” of the initialization structure BleStack_init_t parameters in section 4.1 to enable/disable the controller only mode.
- Basic stack (stm32wba_ble_stack_basic.a) contains only basic supported features or BLE legacy features without extended advertising, neither GATT caching, nor ACI HCI flow control, nor isochronous support, nor L2CAP connection oriented channels. The Host Stack is included, and it supports all the basic GATT, GAP and L2CAP features.
- Link Layer Only stack (stm32wba_ble_stack_llo.a) contains all the features supported by the full stack but doesn’t include the Host Stack (GATT, GAP and L2CAP features)
- Link Layer Only Basic stack (stm32wba_ble_stack_llobasic.a) contains all the features supported by the basic stack but doesn’t include the Host Stack (GATT, GAP and L2CAP features)
For more information, please refer to “STM32WBA_BLE_Wireless_Interface.html” to know which ACI and HCI command/event is supported by each stack configuration.
The table below details the supported features for each BLE stack variants:
Configuration |
FULL = Host Stack + LE Controller |
BASIC = Host Stack + LE Controller
Basic Feature |
LL_ONLY = LE Controller Only |
LL_ONLY_BASIC = LE Controller Only |
Link Layer library dependency |
LinkLayer_BLE_Full_lib |
LinkLayer_BLE_Basic_lib |
LinkLayer_BLE_Full_lib |
LinkLayer_BLE_Basic_lib |
Advertising |
Certified |
Certified |
Certified |
Certified |
Scanning |
Certified |
Certified |
Certified |
Certified |
Slave Connection |
Certified |
Certified |
Certified |
Certified |
Data length extension |
Certified |
Certified |
Certified |
Certified |
Privacy |
Certified |
Certified |
Certified |
Certified |
LE Encryption |
Certified |
Certified |
Certified |
Certified |
Legacy Pairing, LE secure connections |
Certified |
Certified |
Certified |
Certified |
Master Connection |
Certified |
Certified |
Certified |
Certified |
2Mbit |
Certified |
Certified |
Certified |
Certified |
Long Range |
Certified |
Certified |
Certified |
Certified |
Channel Selection Algorithm #2 |
Certified |
Certified |
Certified |
Certified |
Direct Test Mode |
Certified |
Certified |
Certified |
Certified |
Config HCI only |
Certified |
Not Supported |
Certified |
Certified |
Extended Advertising |
Certified |
Not Supported |
Certified |
Not Supported |
Periodic Advertising |
Certified |
Not Supported |
Certified |
Not Supported |
AOA/AOD |
Enabled |
Not Supported |
Enabled |
Not Supported |
Periodic Sync Transfer |
Certified |
Not Supported |
Certified |
Not Supported |
Connected Isochronous |
Enabled |
Not Supported |
Enabled |
Not Supported |
Isochronous Broadcaster |
Enabled |
Not Supported |
Enabled |
Not Supported |
Isochronous Synchronized |
Enabled |
Not Supported |
Enabled |
Not Supported |
LE Power Control |
Enabled |
Not Supported |
Enabled |
Not Supported |
GATT Client |
Certified |
Certified |
N/A |
N/A |
Enhanced ATT |
Enabled |
Not Supported |
N/A |
N/A |
LE L2CAP Connection Oriented channel |
Certified |
Not Supported |
N/A |
N/A |
GATT Caching |
Enabled |
Not Supported |
N/A |
N/A |
Number of Links |
20 |
20 |
20 |
20 |
Table 2: BLE stack variants
Note: The features “Certified” are the supported features that have been officially certified. The feature “Enabled” are the supported features that have not been certified yet.
The BLE stack library is independent from the real-time software environment as well as any real-time resources.
The functions of this library used during run time are:
- The BLE stack commands (HCI, ACI...),
- The BLE stack process,
- The BLE stack callback functions called by the link layer or the platform software (PKA, Timer...).
All these functions must be called from the same level of execution, i.e., from the same task when using a real-time operating system or from the main loop in a bare metal environment.
The BLE stack library depends on (i.e. it must be linked with the following libraries):
- STM32WBAxx Link Layer libraries (c.f. Table 2 BLE stack variants for Link Layer library configuration dependency).
- Standard C library:
o Only basic memory functions are used (memcpy, memset, memmove, memcmp)
The BLE stack library was compiled with the following options in IAR ® environment:
- General options:
o Byte order: Little-endian
o FPU: VFPv5 single precision
- C/C++ Compilation options
o Extra compilation options (--aeabi && --guard_calls)
--aeabi: Used to generate AEABI-compliant object code
--guard_calls: Used mandatory for AEABI-compliant
o Plain 'char' is unsigned.
As mentioned above, the BLE stack library is AEABI compliant; The advantage of adhering to AEABI is that the BLE stack library can be linked with any other AEABI-compliant module, even modules produced by tools provided by other vendors than IAR ®.
For the enum type, the IAR ® C/C++ compiler will use the smallest type required to hold enum constants, preferring signed rather than unsigned.
These compilation options are compulsory:
o Plain 'char' is unsigned
o Short enum:
· For IAR ® compiler, this option is set by default
· Keil µvision ® environment with ARM ® CC compiler, the following option shall be added: -fshort-enums
In Keil µvision ® environment with ARM ® CC compiler, the 2 following linker options shall be added:
· --diag_suppress 6654
· --diag_suppress 6775
In CubeIDE environment with GCC compiler, there is no need to add specific compiler options or linker options.
In order to use the main functions of the BLE stack library, the user application code needs to include “blestack.h”.
In addition, to be able to directly call BLE commands (see section 3.3.2), the application needs to also include “blecore.h”.
Functions |
Parameters |
Return Value |
BleStack_Init |
BleStack_init_t* init_params_p |
tBleStatus |
Table 3: BleStack_Init function
BleStack_Init: The BLE Stack initialization
routine. This function is used to define the memory and configure the BLE
Stack.
All BleStack_init_t parameters are described below:
BleStack_init_t parameters |
Definition |
Value |
uint16_t numAttrRecord |
Maximum number of attribute records related to all the required characteristics (excluding the services) that can be stored in the GATT database, for the specific BLE user application. |
Value = <number of user attributes> + 9
Min value = 9
Max value: depending on the GATT database defined by the user application.
|
uint16_t numAttrServ |
Defines the maximum number of services that can be stored in the GATT database. Note that the GAP and GATT services are automatically added at initialization so this parameter must be the number of user services increased by two. |
Value = <number of user services> + 2.
Min value = 2
Max value: depending on the GATT database defined by the user application
|
uint16_t attrValueArrSize |
Size of the storage area for the attribute values By default, two services are present and must be included, with dedicated characteristics: • Generic access service: service UUID 0x1800, with its three mandatory characteristics: o Device name UUID 0x2A00. o Appearance UUID 0x2A01. o Peripheral preferred connection parameters. UUID 0x2A04. • Generic attribute service. UUID 0x1801, with one optional characteristic: o Service changed UUID 0x2A05. Each characteristic contributes to the attrValueArrSize value as follows: • Characteristic value length plus: o 5 bytes if characteristic UUID is 16 bits o 19 bytes if characteristic UUID is 128 bits o 2 bytes if characteristic has a server configuration descriptor o 2 bytes * NUM_OF_LINKs if the characteristic has a client configuration descriptor o 2 bytes if the characteristic has extended properties |
Depends on the number of attributes used by the application. |
uint8_t numOfLinks |
Maximum number of simultaneous connections that the device will support. |
Min value: 1 Max value: 20 |
uint8_t prWriteListSize |
Maximum number of supported “prepare ATT write request”. |
prWriteListSize value: DIVC (max_char_size, default_att_mtu - 5) * 2
max_char_size: Maximum characteristic’s value size default_att_mtu = 23
|
uint8_t mblockCount |
Number of allocated memory blocks for the BLE stack. |
Value defined by the macro: BLE_MBLOCKS_CALC (PREP_WRITE_LIST_SIZE, MAX_ATT_MTU, NUM_LINKS) + MBLOCK_COUNT_MARGIN)
With: - NUM_LINKS defined by the numOfLinks parameter |
uint16_t attMtu |
Maximum ATT MTU size supported.
|
Min value: 23 Max value: 512 |
uint16_t max_coc_mps |
Used in APIs in l2cap_coc.c to process with a L2CAP connection, send/receive data… Maximum value of the connection-oriented channel Maximum Payload Size. |
Min value: 23 Max value: 248
|
uint8_t max_coc_nbr |
Used in APIs in l2cap_coc.c to process with a L2CAP connection, send/receive data… Maximum number of connection-oriented channels. |
Min value: 0 Max value: 64
|
uint8_t max_coc_initiator_nbr |
Used in APIs in l2cap_coc.c to process with a L2CAP connection, send/receive data… Maximum number of connection-oriented channels in initiator mode. |
Min value:0 Max value: max_coc_nbr
|
uint8_t* bleStartRamAddress |
Start address of the RAM buffer allocated for BLE stack library. It must be a 32bit aligned RAM area. |
|
(uint32_t) total_buffer_size |
Size of the RAM buffer allocated for BLE stack library. |
Value defined by the macro:
With - NUM_LINKS: the maximum number of links defined by the parameter numOfLinks. |
uint8_t* bleStartRamAddress_GATT |
Start address of the RAM buffer allocated for GATT database. It must be a 32bit aligned RAM area. |
|
uint32_t total_buffer_size_GATT |
Size of the RAM buffer allocated for GATT database. |
Value defined by the macro:
With - NUM_ATTR_RECORD: defined by the parameter numAttrRecord. - ATTR_VALUE_ARR_SIZE: defined by the parameter attrValueArrSize.
|
uint16_t options |
Options flags. Definitions for 'options' parameter: |
BLE_OPTIONS_LL_ONLY = 0x0001U, BLE_OPTIONS_NO_SVC_CHANGE_DESC = 0x0002U, BLE_OPTIONS_DEV_NAME_READ_ONLY = 0x0004U, BLE_OPTIONS_EXTENDED_ADV = 0x0008U, BLE_OPTIONS_REDUCED_DB_IN_NVM = 0x0020U, BLE_OPTIONS_GATT_CACHING = 0x0040U, BLE_OPTIONS_POWER_CLASS_1 = 0x0080U, BLE_OPTIONS_APPEARANCE_WRITABLE = 0x0100U BLE_OPTIONS_ENHANCED_ATT = 0x0200U |
uint32_t debug |
Debug flags |
BLE_DEBUG_RAND_ADDR_INIT = 0x00000010UL |
Table 4: BleStack_Init function's parameters
Example:
BleStack_init_t pInitParams;
pInitParams.numAttrRecord = CFG_BLE_NUM_GATT_ATTRIBUTES;
pInitParams.numAttrServ = CFG_BLE_NUM_GATT_SERVICES;
pInitParams.attrValueArrSize = CFG_BLE_ATT_VALUE_ARRAY_SIZE;
pInitParams.prWriteListSize = CFG_BLE_ATTR_PREPARE_WRITE_VALUE_SIZE;
pInitParams.attMtu = CFG_BLE_MAX_ATT_MTU;
pInitParams.max_coc_nbr = CFG_BLE_MAX_COC_NUMBER;
pInitParams.max_coc_mps = CFG_BLE_MAX_COC_MPS;
pInitParams.max_coc_initiator_nbr = CFG_BLE_MAX_COC_INITIATOR_NBR;
pInitParams.numOfLinks = CFG_BLE_NUM_LINK;
pInitParams.mblockCount = CFG_BLE_MBLOCK_COUNT;
pInitParams.bleStartRamAddress = (uint8_t*)buffer;
pInitParams.total_buffer_size = BLE_DYN_ALLOC_SIZE;
pInitParams.bleStartRamAddress_GATT = (uint8_t*)gatt_buffer;
pInitParams.total_buffer_size_GATT = BLE_GATT_BUF_SIZE;
pInitParams.debug = 0x10; // static random address generation
pInitParams.options = 0x0000;
return_status = BleStack_Init(&pInitParams);
The BleStack_Process function runs all Host stack layers’ dedicated processes.
Parameters |
Return Value |
|
BleStack_Process |
None |
BLE_SLEEPMODE_RUNNING (0): BLE_SLEEPMODE_CPU_HALT
(1): |
Table 5: BleStack_Process function
The BleStack_Process function shall be called in the following conditions:
- This function shall be called regularly to handle all stack callbacks when needed. If it returns BLE_SLEEPMODE_RUNNING, it shall be re-called. If it returns BLE_SLEEPMODE_CPU_HALT, there is no need to call this function again and the MCU could go to sleep mode.
- The Link Layer has been scheduled.
- An ACI/HCI command, ACL data or ISO data has been sent to the BLE stack (either by calling BleStack_Request or by direct call to a specific command).
- By the platform software at the timer expiry or the end of PKA activity.
Example:
return_status = BleStack_Process();
if (return_status == BLE_SLEEPMODE_RUNNING)
// BleStack_Process shall be re-called again
else
// The MCU can go to sleep mode
We have two ways to send commands and receive events in ST’s BLE Stack: Transparent Mode or Direct Call mode.
To use BLE stack in Transparent Mode, a buffer that contains the ACI/HCI command or ACL data packet shall be passed as parameter to the function BleStack_Request.
The ACI/HCI command will be executed. The response event (command complete/ command status) is returned in the same buffer, and the size (in bytes) of the response event is given by the function’s return value.
Functions |
Parameters |
Return Value |
BleStack_Request |
uint8_t* buffer [IN/OUT]: |
The size (uint16_t) of the response packet returned in the buffer parameter. |
Table 6: BleStack_Request function
Example:
// It is recommended to initiate the buffer at maximum length that BLE Stack supports.
uint8_t reset_cmd[255] = {0x01, 0x03, 0x0C, 0x00};
/* BLE Stack will execute Reset command, the Command Complete Event will be returned in reset_cmd array,
the total length of event is returned in event_length. */
uint16_t event_length = BleStack_Request(reset_cmd);
// The response packet will be in BLE standard format.
uint8_t cmd_status = reset_cmd[6];
Instead of calling BleStack_Request as in transparent mode, the ACI/HCI commands can be called by using dedicated functions for each command.
Please refer to the document STM32WBA_BLE_Wireless_Interface.html
The HCI commands functions can be found in include/auto/ble_hci_le.h file.
The ACI commands for GAP functions can be found in include /auto/ble_gap_le.h file.
The ACI commands for GATT functions can be found in include /auto/ble_gatt_le.h file.
The ACI commands for HAL functions can be found in include /auto/ble_hal_aci.h file.
The ACI commands for L2CAP functions can be found in include /auto/ble_l2cap_le.h file.
Example:
// Send HCI Reset command
tBleStatus reset_status = hci_reset();
// Send ACI GATT delete include service command
uint16_t Serv_Handle = 0x2456;
uint16_t Include_Handle = 0x8795;
tBleStatus gatt_status = aci_gatt_del_include_service(Serv_Handle, Include_Handle);
To handle ACI/HCI events in its application, the user can choose between two different methods:
1- Use event callbacks framework (via dedicated event callback)
2- Use nested "switch case" event handler (via the BLECB_Indication callback)
Based on its own application scenario, the user should identify the required BLE events to be detected and handled and the application ‘s specific actions as a response to such events.
When implementing a BLE application, the most common and widely used BLE events are the ones related to the discovery, connection, terminate procedures, services and characteristics discovery procedures, attribute modified events on a GATT server and attribute notification/ indication events on a GATT client.
3.3.3.1. ACI/HCI dedicated events callbacks
There is one callback per event. All callback functions can be found in include/auto/ble_events.h file.
If an event is handled in its dedicated callback, the event cannot be handled in the BLECB_Indication callback anymore.
Example:
tBleStatus hci_disconnection_complete_event(uint8_t Status,
uint16_t Connection_Handle,
uint8_t Reason)
{
/* USER CODE BEGIN */
// What to do when the device is disconnected.
/* USER CODE END */
}
3.3.3.2. BLECB_Indication callback
All events which are not handled in their dedicated callback must be handled in the BLECB_Indication callback.
This function will be called by the BLE Stack with the following parameters:
Functions |
Parameters |
Return Value |
BLECB_Indication |
- const uint8_t* data: The data buffer - uint16_t length: The length of the data buffer - const uint8_t* ext_data: The extended data buffer. This buffer is used only for ISO data and ACL data events - uint16_t ext_length: The length of the extended data buffer |
uint8_t: Up to the user to define the return values |
Table 7: BLECB_Indication function
Example:
uint8_t BLECB_Indication(const uint8_t* data, uint16_t length,
const uint8_t* ext_data, uint16_t ext_length)
{
if (data[0] == HCI_LE_META_EVT_CODE)
{
// Check the subevent_code and the parameter length
if ((data[2] == HCI_LE_CONNECTION_COMPLETE_SUBEVT_CODE) && (data[1] == 0x13))
{
hci_le_connection_complete_event_rp0 *p_conn_complete;
p_conn_complete = (hci_le_connection_complete_event_rp0 *) (data + 3);
printf("Connection DONE - Connection handle: 0x%04X\n", p_conn_complete->Connection_Handle);
printf("Connection established with @:%02x:%02x:%02x:%02x:%02x:%02x\n",
p_conn_complete->Peer_Address[5],
p_conn_complete->Peer_Address[4],
p_conn_complete->Peer_Address[3],
p_conn_complete->Peer_Address[2],
p_conn_complete->Peer_Address[1],
p_conn_complete->Peer_Address[0]
);
printf("Connection parameters:\n- Connection Interval: %.2f ms\n- Connection latency: %d\n- Supervision Timeout: %d ms\n",
p_conn_complete->Conn_Interval * 1.25,
p_conn_complete->Conn_Latency,
p_conn_complete->Supervision_Timeout * 10
);
}
}
return 0;
}
The BLE stack uses some generic HW features but lets the application define them by using HW drivers or emulating some of them by SW code.
All the required porting interfaces by the BLE stack are defined in the bleplat.h
The following features are used and need to be implemented on the application side:
- NVM: Non-Volatile Memory used by the security database of the BLE stack.
- Timer: used by several components of the BLE stack.
- AES: Advanced Encryption Standard used by the security manager layer of the BLE stack.
- PKA: Public Key Accelerator used by the controller in the BLE stack.
- RNG: Random Number Generation used by the controller in the BLE stack.
Functions |
Parameters |
Return Value |
BLEPLAT_Init |
None |
None |
Table 8: BLEPLAT_Init function
This function is called by the BLE stack when it is initialized or reset (via hci_reset). The user shall call here the functions to reset the Timer, AES, PKA, NVM and RNG needed for the BLE stack.
The user must implement the functions mentioned below that are called by the BLE stack at runtime.
All the BLEPLAT functions are called from the BLE stack process or commands. Those functions shall return one of the following status values:
Status |
Value |
Description |
BLEPLAT_OK |
0 |
The function did the job and returns an OK status |
BLEPLAT_FULL |
-1 |
The function exits because the HW resource is full |
BLEPLAT_BUSY |
-2 |
The function is busy and is not available for the requested operation |
BLEPLAT_EOF |
-3 |
The function exits and notifies the HW resource (memory for example) reached the end. |
BLEPLAT_WARN |
-4 |
The function runs the asked operation and notifies that the HW resource is near to be full |
BLEPLAT_ERROR |
-5 |
The function exits due to some issue (memory corruption or buffer overflow for example) |
Table 9: BLEPLAT functions' returns
The NVM functions are used to store security database information (security and GATT records) in the NVM, read from the NVM, compare data with the stored data in the NVM and clear the security database or some of it.
Functions |
Parameters |
Return Value |
BLEPLAT_NvmAdd: Store data in the NVM |
- uint8_t type: The type of data to be stored either security data (BLEPLAT_NVM_TYPE_SEC) or GATT data (BLEPLAT_NVM_TYPE_GATT) - const uint8_t* data: The data buffer to be stored - uint16_t size: The size of data to be stored - const uint8_t* extra_data: If there is extra data to be stored too. If not, this parameter shall be passed with “NULL” value - uint16_t extra_size: The size of extra data |
int: One of the return values explained in the section 4.2 |
BLEPLAT_NvmGet: Read data from the NVM |
- uint8_t mode: The mode of NVM reading: o
BLEPLAT_NVM_FIRST o
BLEPLAT_NVM_NEXT o
BLEPLAT_NVM_CURRENT - uint8_t type: The type of data to be read, either security data (BLEPLAT_NVM_TYPE_SEC) or GATT data (BLEPLAT_NVM_TYPE_GATT) - uint16_t offset: The offset from which the NVM starts the read an operation. - uint8_t* data: The pointer to data read by the function - uint16_t size: The size of data to be read |
int: One of the return values explained in the section 4.2 |
BLEPLAT_NvmCompare: Compare passed data as parameter with data stored in the NVM |
- uint16_t offset: The offset from which the NVM starts the comparison - const uint8_t* data: The data to be compared with stored data in the NVM - uint16_t size: The size of data to be compared |
int: One of the return values explained in the section 4.2 |
BLEPLAT_NvmDiscard: Clear a block from the NVM or the whole NVM, storing the security database (security and GATT records) |
- uint8_t mode: Mode of deleting data from the NVM, either clear all the security database (BLEPLAT_NVM_ALL) or the current read NVM block (BLEPLAT_NVM_CURRENT) |
None |
Table 10: BLEPLAT NVM functions
The timer functions are used by the BLE stack to handle all procedures which are time dependent.
The timer should have an accuracy of 1 ms and it is recommended to be able to count up to 24 hours.
Function |
Parameters |
Return Value |
BLEPLAT_TimerStart: Start the Timer |
uint8_t layer: The timer ID to be started uint32_t timeout: The timeout needed to stop the timer (in ms) |
int: One of the return values explained in the section 4.2 |
BLEPLAT_TimerStop: Stop the Timer |
uint8_t layer: The timer ID to be stopped |
None |
BLEPLATCB_TimerExpiry: The timer callback function called when the timeout of a given timer has elapsed |
uint8_t layer: The timer ID |
None |
Table 11: BLEPLAT Timer functions
The AES functions are used by the BLE stack to encrypt a 128-bit single block or to compute CMAC which is needed by BLE security manager.
Function |
Parameters |
Return Value |
BLEPLAT_AesEcbEncrypt: Encrypt a single 128-bit block with a 128-bit key |
const uint8_t* key: table of 16 bytes that contains the key to use (Little Endian format) const uint8_t* input: table of 16 bytes that contains the block to encrypt uint8_t* output: table of 16 bytes that is filled by the function with the encrypted block |
None |
BLEPLAT_AesCmacSetKey: Set the 128-bit key to be used for CMAC computation |
const uint8_t* key: table of 16 bytes that contains the key to use (Little Endian format) |
None |
BLEPLAT_AesCmacCompute: CMAC computation: the function can be called several times with output_tag set to 0 to append data to the computation. It must be called once at the end with output_tag not set at 0 to complete the CMAC computation. |
const uint8_t* input: table of “input_length” bytes that contains the data to append for the CMAC computation uint32_t input_length: number of bytes in “input”. uint8_t* output_tag: must be set to 0 for append. Otherwise: table of 16 bytes that is filled by the function with the computed CMAC tag. |
None |
Table 12: BLE PLAT AES functions
The PKA functions are used by the BLE stack to compute the P-256 public key and the DH key used for BLE secure connections.
Function |
Parameters |
Return Value |
BLEPLAT_PkaStartP256Key: Start P-256 public key generation |
const uint32_t* local_private_key: table of 8 x 32-bit words that contains the P-256 private key (Little Endian format) |
int: One of the return values explained in the section 4.2 |
BLEPLAT_PkaReadP256Key: Get result of P-256 public key generation |
uint32_t* local_public_key: table of 32 x 32-bit words that is filled by the function with the generated P-256 public key (Little Endian format) |
int: One of the return values explained in the section 4.2 |
BLEPLAT_PkaStartDhKey: Start DH key computation |
const uint32_t* local_private_key: table of 8 x 32-bit words that contains the local P-256 private key (Little Endian format) const uint32_t* remote_public_key: table of 32 x 32-bit words that contains the remote P-256 public key (Little Endian format) |
int: One of the return values explained in the section 4.2 |
BLEPLAT_PkaReadDhKey: Get result of DH key computation |
uint32_t* dh_key: table of 8 x 32-bit words that is filled by the function with the generated DH key (Little Endian format) |
int: One of the return values explained in the section 4.2 |
BLEPLATCB_PkaComplete: Callback function implemented by the BLE stack that must be called by the user to inform the BLE stack about completion of P-256 public key generation or DH key computation |
None |
int: One of the return values explained in the section 4.2 |
Table 13: BLEPLAT PKA functions
This function is called by the BLE stack to retrieve “n” x 32*bit words of random values.
Function |
Parameters |
Return Value |
BLEPLAT_RngGet: Get random values. |
uint8_t n: number of 32-bit words to read. uint32_t* val: pointer to a 32-bit table of size ‘n’ that are filled with random values by the function. |
None |
Table 14: BLEPLAT RNG function
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